Method of eliminating tar from gaseous products of dry distillation for the purpose of producing acetate solutions.



'NO. 868E347. PTATENTED 00m, 1907.

- M. KLAR. METHOD OF ELIMINATING TAR FROM GASEOUS PRODUCTS 0F DRYDISTILLATION FOR THE PURPOSE OF PRODUCING ACETATE SOLUTIONS. APPLICATIONFILED SEPT. 16,1905.

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a specificationv 'UNTTED STATES PATENT orrroE.

MAX KLAlt, Ol" HANOVER, GERMANY.

METHOD OF ELIMINATING TAR FROM GASEOUS PRODUCTS OF DRY-DISTILLATION FORTm PURPOSE OF PRODUCING ACETATE SOLUTIONS.

Specification of Letters Patent.

Patented Oct. 15, 1907.

Application filed September-16,1905. Serial No. 278,774.

To all whom it may concern:

Germany, have invented new and useful improvements in a method ofeliminating tar from gaseous products of dry distillation for thepurpose of producing crude pyroligneous acid free from tar direct fromthe condensed vapors, of which the following is l have discovered thatthe quantities of tar contained in the vapors from the still arecompletely eliminated from the stream of vapor and gas, by condensing aportion of the vaporous mixtureafter leaving the retort in an apparatusadjoining the retorts and consisting of compartments arranged above oradjoining each other, and by forcing the ascending or subsequentlyflowing mixture of vapors and gas in an atomized and uncondensed staterepeatedly through the mixed products of condensation at differenttemperatures in the different compartments. In the first or lowercompartment of the apparatus divided into compartments and arrangedbetween retort and cooler, most of the tar which was contained in thevaporous mixture is collected, while from the last or uppermostcompartment, gases and vapors escape which are'absolutel'y free fromtar, and of which the latter are then condensed in a cooler. Instead ofusing the product of the distillation gases condensed at the beginningoi the process as washing liquor, the distilla- .tion gases may becompelled to pass from the beginning through washing liquors of similarcomposition containing decreasing quantities of tar and which are inglyfree from far.

To clearly illustrate the process forming the subjcct matter of myinvention, I shall describe an apparatus by which the process may becarried out. Such an apparatus is shown in the. accompanying drawing.Said drawing is a vertical section of an apparatus in the purposes of myinvention.

The volalilized gases and vapors which come from the retort puss firstthrough .the short pipe '1 into a chamberA. In this chamber, the mainportion of the tar contained in the mixture of gas and vapor'condensesdue to the radiation of its heat through the walls 1 of the chamber. Thecondensed liquid in the chamher A flows-out through a liquid seal S, ofwell-known construction, when it reaches the level of the outlet seal.By reason of the condensation which has oc curred, the vapors whichleave the chamber A contain relatively less tar and more pyroligneousacid. The mixture of gas and vapor which escapes from A passes through abell b or some other similar device into the next chamber B in whichcondensation again takes place resulting in the removal of still more ofthe tar which leaves the remaining vapor mixture correspondingly richerin the desired acid. The same process is repeated in subsequent chambersC, D and E, more and more of the tar beingremoved from the vaporizedmixture with each particular condensation. A constant level ismaintained in the chambers B, G, D and E by the use of overflow pipes a.

1n the embodiment of my invention herein shown, there are differenttemperatures in the several chambers, the temperature of each chamberbeing proportional to the contents of tar, reckoned from the firstchamber to the last.

there is little else than tar, in the second chamber Ba mixturecontaining much tar and little acid, and in the chamber G, theproportion of tar is still less, while the acid constituent is greater,and finally in the last chamber there is practically no tar at all, butonly acid.

The tar separator concerned in my application is 10'- cated between theretorts and pyroligneous acid con- I The liquid in the several cham bersdiffers therefore in so far as in the first chamber densers at suchdistance from each that excessive heatregulated automatically by thecontents of tar contained in the different retorts, in accordance withwell known principles. It has been proved that this mixture of tar andpyroligneous acid, due to the decreasing tar contents and the decreasingtemperature in the direction of flow of the gas current, has theproperty of entirely separating out the tar from the mixture of vaporand gas which subsequently passes out from the retort, during thepassage of the last-named mixture 'through the washing liquids havingdecreasing contents of 'tar and decreasing temperature,

The special construction of the apparatus for carrying out the process,e not form the Subject matter of in tar through a series of distillatesthereof at progresthe invention and the apparatus may be of any suitableconstruction. stance, be arranged side by side instead of one above theother. The illustration shown in the drawing is, therefore, merely to beconsidered an example.

I claim:

1. The method of separating tar from distillation gases which consistsin passing the distillation gases still rich in tar through, thedistillate thereof.

2. The method of separating tar from distillation gases which consistsin passing the distillation gases still rich The different chambers may,for in-.

sively lower temperatures.

3. The method of directly separating tar from pyroligneous acid whichconsists in passing the pyroligneons acid which is still rich in tarthrough a series of chambers containing distillates thereof, thetemperature 01. each corresponding to the composition of the distillatetherein.

In witness whereof I have signed this specification in presence of twowitnesses.

MAX KLAR.

Witnesses Lnoxonn RASCH, Henry J. FULnEiz.

